Thanks @debrichmond, this is very good advice but unfortunately this does not seem to be a memory/cache problem 😕 my phone is brand new and I have the latest version of android, so I am 99% sure that this is a bug on the developer's end. Is there any way to contact the team directly? I'm pretty bummed about losing all that…
Thanks @Freddy_Falkner, but unfortunately this refers to reconnecting to your correct account while my problem is that I get an "unknown error" when I try to log in to my account, after reinstalling the game.